1.
fever, having a fever
An elevated body temperature, typically as a symptom of illness.
子供が発熱した。
My child developed a fever.
発熱がある場合は出勤しないでください。
Please don't come to work if you have a fever.
37.5度以上の発熱は要注意だ。
A fever of 37.5 degrees or higher requires attention.
2.
heat generation, generating heat
The production of heat, used in technical and scientific contexts.
この素材は発熱する。
This material generates heat.
このヒーターは発熱効率が良い。
This heater has good heat generation efficiency.
化学反応による発熱で温度が上がった。
The temperature rose due to heat generated by a chemical reaction.
MEDICAL USAGE:
発熱 is the medical/formal term for having a fever. It's commonly used in medical settings and official announcements.
FEVER THRESHOLDS IN JAPAN:
- 37.5°C: Commonly used threshold for 'fever' in public health guidelines
- 38°C: Generally considered moderate fever
- 39°C+: High fever
VERB USAGE:
- 発熱する: to develop a fever / to generate heat
- 発熱がある: to have a fever
RELATED TERMS:
- 熱: fever, heat (casual term)
- 高熱: high fever
- 微熱: low-grade fever
- 解熱: fever reduction
- 解熱剤: fever reducer, antipyretic
TECHNICAL USAGE (sense 2):
In physics and engineering, 発熱 refers to heat generation:
- 発熱反応: exothermic reaction
- 発熱体: heating element
Related Words
Related:
熱